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William W. Prager, Lawyer, 92

William W. Prager, who practiced law in Manhattan for 50 years, died on Wednesday at the Mount Sinai Medical Center in Manhattan. He was 92 and lived in Manhattan.

The cause was heart failure, said his son, William W. Prager Jr.

During the 1930's Mr. Prager was an assistant United States attorney in Manhattan and an assistant general counsel of the Securities and Exchange Commission.

For many years he was with the Manhattan firm of Spiro Felstiner Prager & Treeger. He graduated from New York University Law School in 1926.

In recent years Mr. Prager was president of the Solon E. Summerfield Foundation of Manhattan.

Mr. Prager is survived by his wife of 67 years, Esther of Manhattan; his son, also of Manhattan; a daughter, Ruth Cogen of Washington; four grandchildren, and four great-grandchildren.

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A version of this obituary; biography appears in print on January 16, 1994, on Page 1001032 of the National edition with the headline: William W. Prager, Lawyer, 92. Order Reprints|Today's Paper|Subscribe